reenable AOT for the AzureMonitorExporter project (Azure#49600)

Author: Timothy Mothra

sdk/monitor/Azure.Monitor.OpenTelemetry.Exporter/tests/Azure.Monitor.OpenTelemetry.Exporter.AotCompatibilityTestApp/ExpectedAotWarnings.txt

@@ -47,7 +47,7 @@ extends:
       safeName: AzureMonitorQuery
     - name: Azure.Monitor.Ingestion
       safeName: AzureMonitorIngestion
-    # CheckAOTCompat: true
-    # AOTTestInputs:
-    # - ArtifactName: Azure.Monitor.OpenTelemetry.Exporter
-    #   ExpectedWarningsFilepath: /Azure.Monitor.OpenTelemetry.Exporter/tests/Azure.Monitor.OpenTelemetry.Exporter.AotCompatibilityTestApp/ExpectedAotWarnings.txt
+    CheckAOTCompat: true
+    AOTTestInputs:
+    - ArtifactName: Azure.Monitor.OpenTelemetry.Exporter
+      ExpectedWarningsFilepath: None